Add Check The Syntax Of nginx Files as a devops til.

Author: jbranchaud

README.md

@@ -44,6 +44,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 ### devops
 
 - [Check The Status of All Services](devops/check-the-status-of-all-services.md)
+- [Check The Syntax Of nginx Files](devops/check-the-syntax-of-nginx-files.md)
 - [Push Non-master Branch To Heroku](devops/push-non-master-branch-to-heroku.md)
 - [Reload The nginx Configuration](devops/reload-the-nginx-configuration.md)
 - [Wipe A Heroku Postgres Database](devops/wipe-a-heroku-postgres-database.md)

devops/check-the-syntax-of-nginx-files.md

@@ -0,0 +1,26 @@
+# Check The Syntax Of nginx Files
+
+The syntax of [`nginx`](https://www.nginx.com/) configuration files can be a
+bit finicky. On top of that, some `nginx` server commands can fail silently.
+Get more confidence by using the following command to check for syntax
+errors in those files:
+
+```bash
+$ [sudo] nginx -t
+```
+
+If there is an error, you might see something like this:
+
+```bash
+$ sudo nginx -t
+nginx: [emerg] unexpected ";" in /etc/nginx/nginx.conf:16
+nginx: configuration file /etc/nginx/nginx.conf test failed
+```
+
+If all looks good, then you'll see this:
+
+```bash
+$ sudo nginx -t
+nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
+nginx: configuration file /etc/nginx/nginx.conf test is successful
+```